BSNL Authentication Failure broadband error : modem model no. DNA-A201BEI

Friends, please help for my bsnl connection. From last two days, can't use internet because my internet won't connect. I see error in modem admin page as "
Authentication Failure.

I called customer care, made complained but still no help and still not working. I even called local broadband department, they said they have already reset my password but still it can't connect with details they provide. Now what should I do ? Where I call, I called 1504 also, but no one ever comes to talk , only IVR and then it disconnects on its own.

I have not changed anything and it suddenly stopped working .

If you are sure that password is correct and you also said that they had reset your password then it must be some technical problem from BSNL side. Now you are on your own, generally such problem get fixed automatically, all you can wait and prey to God that it get noticed by technical staff of BSNL.

Still my problem is not solved. I am not able to login and use my broadband. I complained twice and there were some calls from BSNL internet department asking whether it is fixed or not. I said no. What should I do now ?